SIG LT-40 ARF

This is the SIG LT40 ARF Trainer.  It is powered by a GMS .47 glow engine with a DuBro spinner nut and swings an APC 10 x 6 propeller.  The fuel tubing going to the engine has a Sullivan Crap Trap fuel filter installed.  The supplied fuel tank was changed out for a Hayes Slimline 12 ounce tank because of its greater capacity than the supplied tank and the Hayes tank has the advantage of already having built in fuel nipples.  Fueling is accomplished via a PSP fuel dot so no tubing has to be removed to refuel the plane.  The radio system consists of a JR R610UL 6 channel FM receiver which drives 4 servos (1 rudder, 1 elevator, 1 aileron and 1 throttle).  All servos are HiTec HS475 standard servos.  The aileron control arms are mechanically setup to provide aileron differential.  This is built in by SIG.  Power to the system is supplied by a JR 1100ma NiCad battery pack but as the battery capacity is getting to low, it will soon be replaced by a 2 cell A123 Lithium ferrite nanophosphate battery pack.  The hatch was originally designed to be held in place by 2 screws but these were replaced by Goldberg hatch locks allowing the hatch to be removed without tools.  The model was customized with a custom cut vinyl AMA number decal plus several other decals to give the plane some character.  In addition the nose gear wire was replaced with a Sullivan nose gear wire.  This allowed the nose to sit a bit lower and gave better spring response in case of a less than perfect landing.  Wing span is 70Ē with a wing area of 900 sq. in.  Overall length is 57Ē with an all up weight of approximately 5.25 pounds.  

    As with most SIG products, the construction manual was excellent.  It provided lots of clear pictures and instructions.  All supplied hardware was pretty good.  However, I did change out all the clevises for Sullivanís golden clevises as I consider it one of the best available and cheap insurance against a pin failure common with nylon clevises.  Due to its large wing span, the plane is extremely stable and easy to see when in the air.  The bigger size helps a lot with the stability of the plane during landings, something that is perfect for beginners.  This is my plane of choice when Iím asked what trainer plane to get and Iíve used it in a buddy box situation to let a number of people experience what RC flying is like.  There are a lot of trainer aircraft available to the novice and I like a lot of them, some not so much.  However, this is the trainer plane that in my opinion is the best of the lot.